I'm at a point in my playing where I'm trying to tackle some pretty fast runs eg:- "Oleo" and similiar tunes with this amount of required technique. At a slow speed I can get every note clear and sounding correct however, as I move up the tempo, the fingers (left hand) don't seem to want to keep up the pace. I have noted that when I force my finger into a right angle (left hand) at the strings so that the tip of the finger is at 90 deg to the string(in other words up against the fingernail) I can develop more speed.(however, doesn't feel comfortable) Up till now, I have had a tendancy to generally finger the string with the flatter part of the finger. I 've watched numerous D/B players on DVD on this matter and it seems to vary widely. I wonder if some of you might comment on your fingering position and the reasons why?